For travel tips, recipes and more insight on Italian culture, sign up for CNN’s Unlocking Italy newsletter . This eight-part guide will have you packing your bags in no time. Florence, Italy CNN  —  It was built as a secret passageway for the elite of Florence to pass undetected, far from the regular citizens. Now, for the first time in history, the Corridoio Vasariano, or Vasari Corridor, has opened to the general public. Less a corridor, more a private walking trail through the center of

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